I've played both, Rugby is definitely more physically demanding because it's an ongoing play. Rugby is harder overall, because I've seen NFL players play, and they'd rather go for big shoulder charges instead of actually trying to wrap low, if you got an ex-rugby player to teach NFL players how to tackle they would be much better

Least manly behind golf means that golf is less manly... that I accept
Football is full of injury-fakers, it's not even a question. They are constantly faking injuries to get cards/PKs. Some footballers are better actors than footballers. Ppl fake injury somewhat in all sports (watch the NBA for instance), but it is particularly egregious in football.
I am not saying there are not real injuries as well--there are, to be sure. But there are also extremely high levels of faking, so much that it detracts from the game and makes it less manly.

In football you need a lot of stamina so skinny works the best, of course there are different body types but most good players you see are pretty light weight. It is still very physical sport though, you would know if you'd ever played seriously.
What I believe is that guys who are constantly thinking about manliness and/or being tough are usually very insecure or are trying to compensate something they lack.

IDK, but I'd say that the most manly sport is hunting, because that is what historically men were supposed to do, and this is what really attracts men, guns and meat - that sends away majority of girls - vegetarian peaceful cucks

cs:go?
Yes it is a sport.
eSports (also known as electronic sports, esports, e-sports, competitive [video] gaming, professional [video] gaming or pro gaming) are a form of competition using video games.